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Home >> Kia >> 2009 >> Rio Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (2 Of 2) >> DTC P0451 EVAP. Emission System-Pressure Sensor Range/Performance >> DTC Detecting Condition

DTC P0451 EVAP. Emission System-Pressure Sensor Range/Performance: DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSES

Item Detecting Condition Possible Cause
DTC Strategy
  • Rationality check
  • Poor connection
  • FTPS
  • ECM/PCM
Case 1 Enable Conditions
  • Idle controller activated
Threshold Value
  • Filtered fuel tank pressure > 20.0hPa (41.8 lbf/ft2 )
Diagnostic Time
  • 15 sec
Case 2 Enable Conditions
  • Time after engine start > 3.0s
Threshold Value
  • Filtered fuel tank pressure < -30 hPa (-62.7 lbf/ft2 )
Diagnostic Time
  • 15 sec
Case 3 Enable Conditions
  • Canister purge phase activated
  • Intake manifold press./amb. press. < 0.62
  • Ambient pressure > 680 kPa (1420.21 lbf/ft2 )
Threshold Value
  • Counter of [Δ A pressure < 0.8 kPa (1.67 lbf/ft2 ) when the duty cycle of PCSV is increased more than 30% ] ≥ 2 times
Diagnostic Time
  • 15 sec
MIL ON Condition
  • 2 driving cycle
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